Quote:
Originally Posted by Badbart56
In the past year that I've owned this truck I only saw the message once. I'm probably just missing it. Honestly, my truck doesn't seem to use much DEF. I filled it up two oil changes ago and it's just now below a half tank. So in about 7000 miles it's used about a half tank of DEF. But I'm not currently towing anything either. Just rural 55 to 70 mph driving with a little city driving.
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DEF has nothing to do with DPF regeneration. It is sprayed into the SCR to reduce NOx emissions. Since NOx emissions increase with engine heat, you use more of it while towing.
DPF regens use diesel fuel sprayed into the exhaust to burn off soot accumulation from the DPF.
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2015 Ford F-350 XLT Ruby Red 6.7L Powerstroke, 4x4, Short Bed, Andersen Ultimate Hitch
Cougar High Country 299RKS, Mor/Ryde pin box, 200w solar
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